Hello! When you download the file from itch.io, what file do you get? It should be a .rpa called "wedding_dlc". There shouldn't be anything else to download after that, and if you put that in the "game" folder, you can open the game itself and see if that worked. I'm not sure what "verification" it's asking for. That sounds like it might be a native security feature on your computer, but I can't be sure. Do you know if you have any security features that check suspicious downloads? Because that is something that can sometimes get in the way. Hopefully we can sort out the issue!